Guidelines from Uefa state host clubs are liable for order and security inside and around the stadium.

All clubs may be subject to disciplinary measures for "inappropriate behaviour on the part of their supporters" including the throwing of objects, the lighting of fireworks or any other objects and "any other lack of order or discipline observed inside or around the stadium".

Before the match, police had to remove a banner on the M602 motorway in Salford designed to taunt Liverpool fans heading to Old Trafford.

United were not punished by Uefa after after some of their fans sang offensive Hillsborough disaster chants during the first leg at Anfield.

Stewards had to step in as trouble flared between fans at Old Trafford